\pgfkeys{/tikz/.cd,
	vertical factor/.initial=0.5,
	vertical factor/.get=\vertfactor,
	vertical factor/.store in=\vertfactor,
	start coordinate/.initial=%
		{

			0,\vertfactor},
	sample line width/.initial=very thick,
	start coordinate/.initial =%
		{

			another/. style={

					0,\vertfactor

				}},
	sample line width/.get=\samplelinewidth,
	start coordinate/.initial=%
		{%
			0,\vertfactor}%
		{%
			something else},
}
